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[ PRIVATE LINE TEST FACILITIES FOR PERFORMING TESTS ON COMMUNICATION SYSTEMS COMPRISING TEST MODULES, SERVICE MODULES, SIGNAL TEST MODULES, CORD REELS, POWER PANELS AND A SELECTED NUMBER OF CORD CAGE OPTIONS-NAMELY, OSCILLATOR OPTIONS, AMPLIFIER OPTIONS, ATTENUATOR OPTIONS, TERM SET OPTIONS, REPEAT COIL OPTIONS, RINGDOWN CONVERTER OPTIONS, SIGNAL RELAY OPTIONS, BLANK PLUG-IN CORD OPTIONS, MONITOR SPEAKER OPTIONS, TRANSMISSION PAD CONTROL OPTIONS, AUTOMATIC LEVEL CONTROL OPTIONS, BRIDGING TRANSFORMER OPTIONS, PULSE GENERATOR OPTIONS, OUTPULSER OPTIONS, LOOP BACK OPTIONS AND TEST SHOE CONTROL OPTIONS, SOLD AS A MODULAR UNIT; ELECTRICAL APPARATUS USED AS COMPONENTS OF PRIVATE LINE TEST FACILITIES FOR PERFORMING TESTS ON COMMUNICATION SYSTEMS-NAMELY, TEST MODULES, SERVICE MODULES, SIGNAL TEST MODULES, CORD REELS, POWER PANELS AND CORD CAGE OPTIONS-NAMELY, OSCILLATOR OPTIONS, AMPLIFIER OPTIONS, ATTENUATOR OPTIONS, TERM SET OPTIONS, REPEAT COIL OPTIONS, RINGDOWN CONVERTER OPTIONS, SIGNAL RELAY OPTIONS, BLANK PLUG-IN CORD OPTIONS, MONITOR SPEAKER OPTIONS, TRANSMISSION PAD CONTROL OPTIONS, AUTOMATIC LEVEL CONTROL OPTIONS, BRIDGING TRANSFORMER OPTIONS, PULSE GENERATOR OPTIONS, OUTPULSER OPTIONS, LOOP BACK OPTIONS AND TEST SHOE CONTROL OPTIONS; LOOP BACK TEST SYSTEMS FOR MONITORING AND TESTING TWO-WIRE COMMUNICATION LINES COMPRISING A TRANSMITTER AND A RECEIVER, SOLD AS A UNIT; TRANSMITTERS AND RECEIVERS USED IN LOOP BACK TEST SYSTEMS FOR MONITORING AND TESTING TWO-WIRE COMMUNICATION LINES; FUSE PANELS; STATUS/ALARM CONTROL SYSTEMS FOR CIRCUIT MONITORING AND PROVIDING TELEMETRY DIAGNOSIS AND INFORMATION IN A REMOTE COMMUNICATION SYSTEM NETWORK COMPRISING MASTER ALARM TERMINALS, MASTER DISPLAY TERMINALS AND REMOTE ALARM TERMINALS, SOLD AS A UNIT; TERMINALS USED IN STATUS/ALARM CONTROL SYSTEMS FOR MONITORING AND PROVIDING TELEMETRY DIAGNOSIS AND INFORMATION IN A REMOTE COMMUNICATION SYSTEM NETWORK-NAMELY, MASTER ALARM TERMINALS, MASTER DISPLAY TERMINALS AND REMOTE ALARM TERMINALS; AUDIO DISTRIBUTION AMPLIFIERS; SPEAKER MONITORS; SERIES LOOP ACCESS SYSTEMS FOR PROVIDING ACCESS TO SERIES LOOP CIRCUITS COMPRISING SERIES LOOP ACCESS PANELS AND SERIES LOOP INSTRUMENT PANELS, SOLD AS A UNIT; ] JACKFIELDS; COMMUNICATION COMPONENTS AND DEVICES-NAMELY, [ TERMINAL BLOCKS, CONFERENCE BRIDGES, ] JACK PANELS, JACKS, [ CUTOVER SWITCHES, ] PATCH CORDS, PLUGS [ , LAMP SOCKETS, LAMP CAPS, TELEPHONE COILS, REPEAT COILS, CONNECTORIZED CABLES; SOLID STATE TELEGRAPH RELAYS; BATTERY CHARGERS-NAMELY, AIRCRAFT BATTERY CHARGERS AND INDUSTRIAL AND LEISURE VEHICLE BATTERY CHARGERS; DIRECT CURRENT AMMETERS; TRANSFORMERS; PRIVATE LINE TEST FACILITIES FOR PERFORMING TESTS ON COMMUNICATION SYSTEMS COMPRISING ACCESS MODULES, LINE SELECT MODULES, DIAL/SIGNAL MODULES, TEST MODULES AND OHMMETERS, SOLD AS A UNIT; CURRENT SENSORS; MAGNETIC AMPLIFIERS; BROADCAST FILTERS; MOTOR SPEED CONTROLS FOR CONTROLLING THE SPEED OF ELECTRIC MOTORS; POWER SUPPLY UNITS FOR SUPPLYING POWER TO ELECTRICAL APPARATUS-NAMELY, COMPUTERS ]